CN102270836B - Wide-area over-current protection method and system for power distribution network - Google Patents
Wide-area over-current protection method and system for power distribution network Download PDFInfo
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- CN102270836B CN102270836B CN201110210591.1A CN201110210591A CN102270836B CN 102270836 B CN102270836 B CN 102270836B CN 201110210591 A CN201110210591 A CN 201110210591A CN 102270836 B CN102270836 B CN 102270836B
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- 230000016507 interphase Effects 0.000 abstract 4
- 238000010586 diagram Methods 0.000 description 6
- 238000012544 monitoring process Methods 0.000 description 3
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Abstract
The invention discloses a wide-area over-current protection method and system for power distribution networks. A wide-area protection main station collects information whether over-current protection devices monitor over-currents through a high-speed signal channel, which are separately mounted at the sites of individual power distribution switches in a power distribution network to be protected; if the wide-area protection main station collects the over-current information, whether an inter-phase short-circuit fault occurs inside a generalized node is judged; if the inter-phase short-circuit fault occurs inside the generalized node, the wide-area protection main station remotely controls the most upstream power distribution switch in the generalized node to trip out to clear the fault. The method and system disclosed by the invention achieve selective protection against over-currents due to inter-phase short-circuit in power distribution networks without needing time-limit cooperation, can be used for solving the difficulty of time-limit cooperation in power distribution networks and isolating inter-phase faults in power distribution networks with minimal switch on-off operation frequency, and are suitable for different types of open-loop power distribution networks.
Description
Technical field
The present invention relates to phase-to phase fault guard method and the system of power distribution network, specifically a kind of power distribution network Wide-area over-current protection method and system
Background technology
The phase fault of 10～35kV medium voltage distribution network (hereinafter to be referred as power distribution network) comprises three-phase shortcircuit, line to line fault and line to line fault ground connection.When power distribution network generation phase fault, the overcurrent of generation will be much larger than rated current.But because distribution line is shorter, distribution load distributes along distribution line, and distribution line is along the line by multiple panel switches segmentations, and therefore power distribution network overcurrent protection lacks selectivity, and overstep tripping often occurs, and causes power failure range to expand.
The phase fault of power distribution network belongs to most common failure, mainly contains following several at present for the guard method of power distribution network phase fault:
(1), adopt transformer station's overcurrent protection quick-break tripping operation: no matter where fault occurs in power distribution network, all adopts the overcurrent protection quick-break excision fault that is installed in transformer station.
Radial distribution networks as shown in Figure 2, outlet switch A place of transformer station installing overcurrent fast tripping protection, panel switches B, C, D, E, F place do not install overcurrent fast tripping protection.In the time of CD circuit generation phase fault, the outlet switch A of transformer station overcurrent quick-break tripping operation excision fault.
Power distribution network hand in hand as shown in Figure 3, the outlet switch A of transformer station, E place installing overcurrent fast tripping protection, panel switches B, C, D place do not install overcurrent fast tripping protection.When normal operation, interconnection switch C disconnects.In the time of CD circuit generation phase fault, the outlet switch E of transformer station overcurrent quick-break tripping operation excision fault.
Visible, the method has caused whole piece feeder line to have a power failure, and has expanded power failure range.
(2) adopt the ladder time coordinations method of overcurrent protection to excise fault: the operation time limit of upper level overcurrent protection is than the long △ t of the operation time limit of next stage overcurrent protection.The problem that the method exists is:
1. because distribution protection progression is a lot, often cannot meet the requirement of the 0.3～0.5s of transformer station time delay fast tripping protection allowed band.Radial distribution networks as shown in Figure 2, if △ t=0.15s(meets the requirement of spring operation switch), △ tF=0s, △ tE=0.15s, △ tC=0.3s, △ tB=0.45s, △ tA=0.6s, therefore, the overcurrent protection at multiple panel switches place need to be adjusted into identical operation time limit (△ tF=0s, △ tE=0s, △ tC=0.15s, △ tB=0.15s, △ tA=0.3s), or some panel switches place does not install overcurrent protection (as do not installed at F place, △ tE=0.15s, C place does not install, △ tB=0.15s, △ tA=0.3s), make protection lose selectivity.
2. for hand in hand circuit as shown in Figure 3, owing to there being bilateral source, if adopt direction overcurrent protection, still there will be progression cannot meet too much the requirement of the 0.3～0.5s of transformer station time delay fast tripping protection allowed band, for example, coordinate from right to left △ tE=0s, △ tD=0.15s, △ tC=0.3s, △ tB=0.45s, △ tA=0.6s; Coordinate from left to right △ tA=0s, △ tB=0.15s, △ tC=0.3s, △ tD=0.45s, △ tE=0.6s.Therefore, generally adopt the method coordinating from interconnection switch to both sides, that is: △ tD=0s, △ tE=0.15s, △ tB=0s, △ tA=0.15s.In the time that wiring is in abnormal running mode hand in hand, overcurrent protection will lose selectivity.
3. the power distribution network to labyrinth, the power distribution network as shown in accompanying drawing 4,5, because power distribution network operational mode is a lot, often cannot adopt ladder time setting method to ensure selectivity.On the other hand, because power distribution network transformation is frequent, the calculating of protection definite value and more new capital have difficulties.
Summary of the invention
The object of the invention is the problem for above-mentioned distribution protection phase fault time coordinations difficulty; a kind of Wide-area over-current protection method is provided; the method can be applied between on-pole switch, phase fault protection between on-pole switch and distribution switching station (or distribution ring main unit), between distribution switching station (or distribution ring main unit) and user demarcation switch; realize without time coordinations, and can selectivity tripping operation.
The technical scheme that realizes the object of the invention employing is:
A Wide-area over-current protection method for power distribution network, comprises the following steps:
Wide area protection main website collects the loose overcurrent protective device of installing of each panel switches punishment in protected power distribution network by IA High Speed Channel and whether monitors overcurrent information;
If wide area protection main website collects the information of described overcurrent, judge whether phase fault occurs in generalized node inside;
If phase fault occurs in generalized node inside, upstream panel switches in this generalized node of wide area protection main website remote control, make its tripping operation excision fault.
Described overcurrent protective device is monitored by the three-phase current of panel switches, and its arbitrary phase current is greater than setting current, judges that this electric current is overcurrent.
Described generalized node refers to using panel switches as border, the electrical communication region being made up of some panel switches and distribution line.
The described method that judges whether phase fault occurs in generalized node inside is:
(1) if generalized node only has an edge of table circle panel switches place to monitor overcurrent, phase fault must occur in the inside of generalized node;
(2) if generalized node is terminal generalized node, without downstream generalized node, and have at least a station power distribution switch place to monitor overcurrent, phase fault must occur in the inside of generalized node;
(3) if generalized node has at least two edge of table circle panel switches places to monitor overcurrent, phase fault must occur in the outside of generalized node i.
Described wide area protection main website collects the method whether overcurrent protective device monitor overcurrent information and comprises that wide area protection main website sends two kinds of patterns of overcurrent information (passive collection) to wide area protection main website immediately after overcurrent protective device inquiry overcurrent information (active collection), overcurrent protective device monitor overcurrent.
In addition, the present invention also provides a kind of protection system of power distribution network wide area overcurrent, and this system comprises:
Overcurrent protective device, for monitoring the electric current by described panel switches, and judges whether this electric current is overcurrent;
Wide area protection main website, the information of overcurrent whether detected for overcurrent protective device described in real-time collecting, and judge whether to produce phase fault according to this real time information, and the position of phase fault generation, remote control disconnects the panel switches of described generation phase fault;
Wherein, it is upper that described overcurrent protective device is installed on panel switches (comprising the panel switches in on-pole switch and distribution switchgear cabinet), and described wide area protection main website collects described overcurrent protective device by IA High Speed Channel communication network and overcurrent information whether detected.
Described overcurrent protective device monitoring three-phase current, its arbitrary phase current is greater than setting current, judges this electric current generation overcurrent.
The overcurrent information that overcurrent protective device is judged is collected by optical fiber, twisted-pair feeder or wireless private network by described wide area protection main website.
Adopt the power distribution network overcurrent protection of this scheme realization without the wide area protection method of time coordinations, there is these remarkable advantages and beneficial effect:
1, than existing method, the inventive method can make the overcurrent protection of phase fault just can realize selectivity action without time coordinations, solve the problem of power distribution network time coordinations difficulty, solve the integrity problem that current non-selective tripping operation brings, avoid the multiple switching in process of fault isolation to divide closing operation, cause the impact that has a power failure little to user, reduced the switch impact in useful life;
2, due to without time coordinations, only need the overcurrent definite value of adjusting, reduced the time limit value maintenance workload of wasting time and energy and easily makeing mistakes;
3, the impact of information dropout or information errors has been reduced to circuit part by the inventive method, improved power supply reliability.
Brief description of the drawings
Fig. 1 is the structured flowchart of the protection system of power distribution network wide area overcurrent of the present invention.
Fig. 2 is the workflow diagram of the overcurrent protection of the inventive method.
Fig. 3 is the workflow diagram of the wide area protection main website of the inventive method
The radial distribution networks schematic diagram of Tu4Shi Dai branch.
Fig. 5 is the power distribution network schematic diagram of handing in hand.
Fig. 6 is the multi-joint network power distribution network schematic diagram of handing in hand.
Fig. 7 is complex web trellis power distribution network schematic diagram.
In Fig. 4～7, the roundlet that the black on power distribution network is filled represents normally closed panel switches; The roundlet that white is filled represents often to open panel switches.
Embodiment
Below in conjunction with the drawings and specific embodiments, technical solution of the present invention is described further.
As shown in Figure 1, panel switches or distribution switchgear cabinet place are all provided with overcurrent protective device, and each overcurrent protective device is connected with wide area protection main website by IA High Speed Channel communication network.In the present embodiment, panel switches are all equipped with intelligent terminal FTU, and distribution switchgear cabinet is equipped with DTU.In the present embodiment, communication channel can adopt the conventional IA High Speed Channel such as optical fiber, twisted-pair feeder or wireless private network (as WiMax), and IA High Speed Channel will increase the rapidity of protection action and Fault Isolation.Intelligent apparatus 1 is communicated by letter with the intelligent apparatus of all contiguous panel switches (distribution switchgear cabinet), and communication mode can be typical distributed P 2 P mode, can be also client-server mode.Communication protocol is followed IEC870-5-101, IEC870-5-104, DNP, IEC61850(GB DL/Z860) etc. standard.
The present invention protects the method for power distribution network wide area overcurrent automatically as shown in accompanying drawing 2, Fig. 3:
Overcurrent protective device is monitored by the three-phase current of switch, and its arbitrary phase current is greater than setting current, judges that this electric current is overcurrent.
Wide area protection main website is by the overcurrent information of high-speed communication channel real-time collecting overcurrent protective device monitoring; and judging whether phase fault occurs in generalized node inside, described generalized node refers to electrical communication region using panel switches as border, that be made up of some panel switches and distribution line.In the present invention, generalized node in most cases refers to the set by a distribution line (with its T link) and direct-connected panel switches thereof.As shown in Figure 2, distribution line AB and panel switches A, B can form a generalized node; Distribution line CD, CE and panel switches C, D, E also can form a generalized node, etc.But principle of the present invention is also applicable to the generalized node of general significance more, as the generalized node being formed by distribution line AB, BC and panel switches A, B, C.
Judge whether phase fault occurs in generalized node inside, comprise following several situation:
(1) if generalized node only has an edge of table circle panel switches place to monitor overcurrent, phase fault must occur in the inside of generalized node;
(2) if generalized node is terminal generalized node, without downstream generalized node, and have at least a station power distribution switch place to monitor overcurrent, phase fault must occur in the inside of generalized node;
(3) if generalized node has at least two edge of table circle panel switches places to monitor overcurrent, phase fault must occur in the outside of generalized node i.
Below in conjunction with accompanying drawing 4～7, illustrate the inventive method.
Embodiment 1
Shown in Figure 4; the present embodiment is selected the radial distribution networks with branch; if CD circuit generation phase fault, the overcurrent protective device at panel switches A, B, C place all monitors overcurrent, and the overcurrent protective device at panel switches D, E, F place does not all monitor overcurrent.To the generalized node being made up of circuit AB, panel switches A, B, because the overcurrent protective device at border panel switches A, B place all monitors overcurrent, there is not phase fault in circuit AB; To the generalized node being made up of circuit BC, panel switches B, C, because the overcurrent protective device at border panel switches B, C place all monitors overcurrent, there is not phase fault in circuit BC; To the generalized node being formed by circuit CD, CE, panel switches C, D, E, because the overcurrent protective device at panel switches C place, border monitors overcurrent, and the overcurrent protective device at border panel switches D, E place does not all monitor overcurrent, there is phase fault in circuit CD or CE, and the remote control of wide area protection main website disconnects panel switches C excision fault;
Embodiment 2
Shown in accompanying drawing 5, the present embodiment is selected power distribution network hand in hand.If AB circuit generation phase fault, the overcurrent protective device at panel switches A place monitors overcurrent, and the overcurrent protective device at panel switches B, C, D, E place does not monitor overcurrent.To the generalized node being formed by circuit AB, panel switches A, B, because the overcurrent protective device at panel switches A place, border monitors overcurrent, and the overcurrent protective device at panel switches B place, border does not monitor overcurrent, there is phase fault in circuit AB, and the remote control of wide area protection main website disconnects panel switches A excision fault; If CD circuit generation phase fault, the overcurrent protective device at panel switches E, D place all monitors overcurrent, and the overcurrent protective device at panel switches C place does not monitor overcurrent.To the generalized node being made up of circuit DE, panel switches D, E, because the overcurrent protective device at border panel switches D, E place all monitors overcurrent, there is not phase fault in circuit DE; To the generalized node being formed by circuit CD, panel switches C, D; because the overcurrent protective device at panel switches D place, border monitors overcurrent; and the overcurrent protective device at panel switches C place, border does not monitor overcurrent; there is phase fault in circuit CD, and the remote control of wide area protection main website disconnects panel switches D excision fault.
Embodiment 3
Shown in accompanying drawing 6, the present embodiment is selected the multi-joint network power distribution network of handing in hand.If HI circuit generation phase fault, the overcurrent protective device at panel switches I, J place all monitors overcurrent, and the overcurrent protective device at other panel switches places does not all monitor overcurrent.To the generalized node being made up of circuit IJ, panel switches I, J, because the overcurrent protective device at border panel switches I, J place all monitors overcurrent, there is not phase fault in circuit IJ; To the generalized node being formed by circuit IH, IK, panel switches I, H, K; because the overcurrent protective device at panel switches I place, border monitors overcurrent; and the overcurrent protective device at border panel switches H, K place does not all monitor overcurrent; there is phase fault in circuit IH or IK, and the remote control of wide area protection main website disconnects panel switches I excision fault.
Embodiment 4
Shown in accompanying drawing 7, the present invention is applied to complex web trellis power distribution network.If BC circuit generation phase fault, the overcurrent protective device at panel switches A, B place all monitors overcurrent, and the overcurrent protective device at other panel switches places does not all monitor overcurrent.To the generalized node being made up of circuit AB, panel switches A, B, because the overcurrent protective device at border panel switches A, B place all monitors overcurrent, there is not phase fault in circuit AB; To the generalized node being formed by circuit BC, BJ, panel switches B, C, J; because the overcurrent protective device at panel switches B place, border monitors overcurrent; and the overcurrent protective device at border panel switches C, J place does not all monitor overcurrent; there is phase fault in circuit BC or BJ, and the remote control of wide area protection main website disconnects panel switches B excision fault.
Claims (1)
1. a power distribution network Wide-area over-current protection method, is characterized in that, comprises the following steps:
Wide area protection main website collects the loose overcurrent protective device of installing of each panel switches punishment in protected power distribution network by IA High Speed Channel and whether monitors overcurrent information;
If wide area protection main website collects described overcurrent information; judge whether phase fault occurs in generalized node inside; described generalized node refers to using panel switches as border; the electrical communication region being formed by some panel switches and distribution line; wherein, judge that the method whether phase fault occurs in generalized node inside is:
(1) if generalized node only has an edge of table circle panel switches place to monitor overcurrent, phase fault must occur in the inside of generalized node;
(2) if generalized node is terminal generalized node, without downstream generalized node, and have at least a station power distribution switch place to monitor overcurrent, phase fault must occur in the inside of generalized node;
(3) if generalized node has at least two edge of table circle panel switches places to monitor overcurrent, phase fault must occur in the outside of generalized node;
If phase fault occurs in generalized node inside, upstream panel switches in this generalized node of wide area protection main website remote control, make its tripping operation excision fault;
Described wide area protection main website collects the method whether overcurrent protective device monitor overcurrent information and comprises: wide area protection main website sends two kinds of patterns of overcurrent information to wide area protection main website immediately after overcurrent protective device inquiry overcurrent information and overcurrent protective device monitor overcurrent.
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| CN201110210591.1A CN102270836B (en) | 2011-01-30 | 2011-07-26 | Wide-area over-current protection method and system for power distribution network |
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| CN201110032597.4 | 2011-01-30 | ||
| CN2011100325974A CN102104246A (en) | 2011-01-30 | 2011-01-30 | Method and device for reducing time limit combination step progression of distribution network relaying protection |
| CN201110210591.1A CN102270836B (en) | 2011-01-30 | 2011-07-26 | Wide-area over-current protection method and system for power distribution network |
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| CN102270836A CN102270836A (en) | 2011-12-07 |
| CN102270836B true CN102270836B (en) | 2014-07-09 |
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| CN2011100325974A Pending CN102104246A (en) | 2011-01-30 | 2011-01-30 | Method and device for reducing time limit combination step progression of distribution network relaying protection |
| CN2011102105521A Pending CN102270835A (en) | 2011-01-30 | 2011-07-26 | Distributed over-current protection and interphase fault isolation method for distribution network |
| CN2011102105540A Pending CN102270833A (en) | 2011-01-30 | 2011-07-26 | Method and device for reducing number of relay protection time limit fit staircases in distribution network |
| CN201110210591.1A Active CN102270836B (en) | 2011-01-30 | 2011-07-26 | Wide-area over-current protection method and system for power distribution network |
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| CN2011102105521A Pending CN102270835A (en) | 2011-01-30 | 2011-07-26 | Distributed over-current protection and interphase fault isolation method for distribution network |
| CN2011102105540A Pending CN102270833A (en) | 2011-01-30 | 2011-07-26 | Method and device for reducing number of relay protection time limit fit staircases in distribution network |
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| CN101902037A (en) * | 2010-07-30 | 2010-12-01 | 武汉百叡电力技术有限公司 | Distributed single-phase earth fault isolation method in low-current earthed system |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN102104246A (en) | 2011-06-22 |
| CN102270833A (en) | 2011-12-07 |
| CN102270836A (en) | 2011-12-07 |
| CN102270835A (en) | 2011-12-07 |
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